Military Footage: Mexican-Airforce. March, 5th, 2004. Filmed by multiple Pilots using infrared equipment. Only 3 of these Objects showed up on Radar.

That must be some old ass radar that can't differentiate moving targets from ground clutter.

Radar is radar. When you're in the middle of the ocean you will just see light speckling from the waves and then a large, very obvious signature from the oil rig floating in the middle of nowhere. There is nothing to differentiate it from, it's just going to look like any other big metal target.

Here's a typical radar signature of a moving ship, and a stationary island

Notice the island has no green trail, because it's not moving. However if the radar is set to relative trails, it would show the islands trail of movement relative to the observer and look exactly like a moving target.

If you were fatigued and/or not paying that much attention to the radar settings, it could look exactly like a large, metallic moving object. Because that's exactly what it is. And oil rig, moving relative to the plane's position.

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